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[TLS] drop obsolete SSL 2 backwards compatibility from TLS 1.3 draft

Dave Garrett <davemgarrett@gmail.com> Tue, 23 December 2014 00:45 UTC

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From: Dave Garrett <davemgarrett@gmail.com>
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Date: Mon, 22 Dec 2014 19:45:35 -0500
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Subject: [TLS] drop obsolete SSL 2 backwards compatibility from TLS 1.3 draft
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I've submitted a straightforward PR to remove the SSL 2 backwards compatibility 
section from the current TLS 1.3 draft:

https://github.com/tlswg/tls13-spec/pull/105

SSL 2.0 backwards compatibility was previously deprecated in TLS 1.2 (2008) and 
was warned to be "phased out with all due haste". RFC 6176 (2011) prohibits it 
entirely. It's a section of obsolete complexity still in the draft.

The PR replaces the section with a simple "MUST NOT" send or accept for TLS 1.3 
implementations.

Eric Rescorla requested I post this to the list, though I would hope that at 
this point this would be a noncontroversial edit. The only functional difference 
between this language and RFC 6176 is that servers were still permitted to 
accept version 2 CLIENT-HELLO messages, though not actually negotiate the 
protocol.

https://tools.ietf.org/html/rfc6176

There's no reason to maintain any backwards support here just for Internet 
Explorer 2.0 on Windows 3.1.


Dave

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